FYI, there are multiple methods to download “digitally loaned” books off IA, the guides exist on reddit. The public domain stuff is safe, but the stuff that is still under copyright yet unavailable by other means (Libgen/Anna’s Archive, or even normal physical copies) should definitely be ripped and uploaded to LG.
The method I use, which results in best images, is to “loan” the book, zoom in to load the highest resolution, and then leaf through the book. Periodically extract the full images from your browser cache (with e.g. MZCacheView). This should probably be automatised, but I’m yet to find a method, other than making e.g. an Autohotkey script. When you have everything downloaded, the images can be easily modified (if the book doesn’t have coloured illustrations IMO it is ideal to convert all images to black-and-white 2-bit PNG), and bundled up into a PDF with a PDF editor (I use X-Change Editor; I also like doing OCR, adding the bookmarks/outline, and adding special page numbering if needed - but that stuff can take a while and just makes the file easier to handle, it’s not necessary). Then the book can be uploaded to proper pirate sites and hopefully live on freely forever. Also there are some other methods you can find online, on reddit, etc.